Kenwood KA-9100 amplifier

Independent Dual Power Supplies for Both Channels and a Separate Preamplifier Power Supply

Obviously, no stereo imaging can be true unless there is complete channel separation. And one of the drawbacks of conventional amplifiers is that a single power supply creates Dynamic Crosstalk Distortion - a fact first discovered by our own engineers. This form of distortion had been overlooked in conventional measuring methods, which reveal static, rather than dynamic distortion. Following this important discovery, Kenwood's engineers re-designed the power supply into two totally independent supply systems, each with a large separate power transformer, and four large 12,000 µF electrolytic capacitors. A transistorized voltage regulator reduces interference between stages. But not content with this, they also designed a separate power supply for the preamplifier stage to suppress interference between the power amplifier and preamplifier in the same channel. You could, in fact, call this a "three-power supply system"/ the effect is that Dynamic Crosstalk Distortion has been virtually eliminated. Transient response is much improved. Excellent damping yields crisp and accurate sound. And so reproduced sound - particularly in the bass frequencies - is wonderfully rich and clear.

Direct-Coupled Equalizer Section Realizes very High Signal-to-Noise-Ratio:

An exceptionally high 83 dB Signal-to-Noise-Ratio (IHF-A curve) for Phono 1 & 2 is the result of a well designed, three-stage, direct-coupled ICL equalizer section, using FETs. Both phase and transient response are excellent, and distortion is low over a very wide range. Moreover, the use of the Gain selector at the +10 dB position allows a high 73 dB Signal-to-Noise-Ratio: for phono 0,8 mV sensitivity. The maximum phono input level for Phono 1 is a high 250 mV RMS, so there's no danger of overloading when you're playing musical passages of exceptional dynamic range.

Sophisticated Tone Control Give You Real Mastery Over Your Sound

Kenwood's concern for musical purity has given top priority to tone controls, so an elaborate system has been devised to suit all individual listening conditions and needs. BAXANDALL negative feedback low distortion tone controls give you the advantage of great precision and enormous flexibility for adjustment. The control range is 17,5 dB, in 1,5 dB click0stop steps. There are two selectable turnover points, 400 Hz for bass and 3 kHz for treble. These let you precisely compensate for your room characteristics. Moreover, the tone defeat is not simply a tone-out switch, but a true bypassing circuit, so that distortion and channel crosstalk are eliminated and tonal quality retains its excellence.

Two Steep Slope Filters

Here again, a bypassing defeat circuit is used to minimize distortion. These two filters have a characteristic steep slope of 12 dB/oct, allowing the music to pass freely while cutting out interference. There is a high filter with a cut-off point of 8 kHz, and a subsonic filter with a cut-off point of 18 Hz. High frequency noises such as record scratch, and low or subsonic influence generated by record warp or turntable rumble are effectively eliminated.

Unique tape-Through Circuitry

Kenwood's versatile tape circuitry permits simultaneous recording of two tape decks, and monitoring of both. There's also inter-tape dubbing both ways. And there's our now familiar tape-through facility that lets you listen to a different source while recording or dubbing takes place.

The Simpler The Circuitry The Better The Sound

Many circuitry design improvements have been made to enhance tonal quality. Some of them are major developments such as our DC power amplifier and dual power supplies, developed at our laboratories. With a full ICL (Input Capacitor-less) system, ICL circuitry is used in both the crucial equalizer and tone control sections. For all these circuits, inputs are directly connected to the unit without having to pass through input capacitors which produce distortion. Moreover, if you look inside the KA-9100 you'll probably be surprised at how "clean" it looks. This is not just cosmetic treatment, however. We know that there are clear-cut audio advantages in reducing wiring, and by making direct connections to the printed circuit boards. The more wiring there is, the more chance for hum and noise and various kinds of distortion that affect the sound. One example is the speaker selector. Instead of long wiring leading to the back panel and picking up noise on the way, there's a long shaft, and the actual selector is next to the speaker terminals. There are many other examples of this wire elimination to be seen, all contributing towards the refinement of that special Kenwood tonal quality.

Professional, Full-Scale Attenuator Type Volume Control With Gain Control

The dual combination of a tree-step (+10db, 0, -10 dB) Gain control and full-scale attenuator type 32-step volume control provides you with highly accurate volume attenuation. This means that the entire audible range is increased or reduced logarithmically. Your sound, even at low levels, remains naturally balanced. The Gain control also is highly useful when using tape decks and turntables which need some compensation for sensitivity low throughout the attenuation range. As you can see on the back page, other comparable models rarely maintain this low residual noise level over the whole volume range.

Two-Step Loudness Control

This loudness selector boosts the low range frequencies below two levels, giving you more control over which levels need more boosting. At -30 dB volume level, a 10 dB boost is made at 100 Hz or 30 Hz. You'll find this gives your ear the necessary compensation when listening at very low volume.

Pre-Out and Power-In Terminals

A thoughtful feature for the more professionally minded in the selector that allows the DC power amplifier and full ICL control amplifier to be used separately for multi-amp hi-fi systems.

Twin Power meters

These days, audiophiles are interested in every aspect of their components, and such features as accurate power monitors are essential. Kenwood's power meters are of a logarithmic compression type with two selectable ranges: 0,01W - 100 W and 0,01W -0,3W (for low level monitoring).

Specifications

Power Amplifier Section

Power Output:  90 watts per channel, minimum RMS, at 8 Ω. From 20 Hz to 20 kHz with no more than 0,03% Total harmonic Distortion:

Both Channel Driven :

95 + 95 watts (8 Ω) at 1,000 Hz

110 + 110 watts (4 Ω) at 1,000 Hz

Dynamic Power Output:  470 watts (4 Ω)

Total harmonic Distortion:

0,03% at rated power into 8 Ω

0,01% at 1 watt into 8 Ω

Intermodulation Distortion (60 Hz : 7 kHz  = 4 : 1)

0,03% at rated power into 8 Ω

0,01% at 1 watt into 8 Ω

Power bandwidth:  5 Hz to 60,000 Hz

Frequency Response:  DC to 100,000 Hz +0 dB. -1 dB

Signal-to-Noise-Ratio:  115 dB (short circuited)

Damping Factor:  50 at 8 Ω

Input Sensitivity/Impedance:  1,0 V/ 50 kΩ

Speaker Impedance:  4 Ω to 16 Ω 

Pre-Amplifier Section

Input Sensitivity/Impedance

Phono 1 :  2,5 mV/50 kΩ 

Phono 2 :  2,5 mV/50 k Ω 

Tuner :  150 mV/50 kΩ 

Aux :  150 mV/50 k Ω 

Tape A, B :  150 mV/50 kΩ 

Signal-to-Noise-Ratio:

Phono 1 :  83 dB 

Phono 2 :  83 dB 

Tuner :  100 db

Aux :  100 dB 

Tape A, B :  100 dB

Maximum Input level Phono 1 :  250 mV 9rms) T.h.d 0,03% at 1,000 Hz

Output/ Level Impedance

Tape Rec (pin) :  150 mV/450 Ω

Tape Rec (DIN) :  30 mV/80 k Ω

Pre Out :  1 V/330 Ω

Frequency Response:

Phono :  RIAA standard curve +0,2 dB, -0,2 dB

Aux. Tape :  7 Hz - 50 kHz +0 dB, -1 dB

Tone Control 

Bass ;  ±7,5 dB at 100 Hz (turnover at 400 Hz)

Treble :  ±7,5 dB at 10 kHz (turnover at 3 kHz)

Loudness Control (-30 dB):  +10 dB at 100 Hz; +10 dB at 30 Hz

Subsonic Filter:  18 Hz. 12 dB/oct.

High Filter ;  8 kHz, 12 dB/oct.

General

AC Outlets:  2 switched, 1 unswitched

Power Consumption:  660 watts at full power

Dimensions (W x H x D):  430 x 149 x 384 mm (16-15/16" x 5-7/8" x 15-1/8")

Weight (net):  16,7 kg (36,8 lbs)

AKG K-240 headphones

 AKG K-240

Among AKG patents, none is more significant than the Passive Diaphragms found in K-240 (K-340, K-3) models. Mounted within each earpiece, they perform two distinct functions when activated by sound waves. – They are acoustically transparent above 200 Hz, and one listens in a virtually “free field”. Unwanted mid- and high-frequency peaks and valleys of conventional circumaural (closed) headphones are eliminated. Sound enters the ear in a “normal” manner as in supra-aural (open) headphones. –Below 200 Hz, combined with acoustical “screens”, they form a controlled, damped vent to flatten out any bass peaks, thus eliminating boominess common in most circumaural headphones, and extends linear response lower than would otherwise be possible in supra-aural headphones. The result is pure listening pleasure, you hear tone gradations often lost in loudspeakers or in the listening room environment.

The Complete Free-Field Headphone

The K-240 is the first totally sound and comfort engineered headphone incorporating all the features necessary for complete listening enjoyment; accurate stereo imagery, outstanding fidelity of reproduction at all listening levels, extreme comfort with virtually no fatigue under prolonged use, and uncomplicated ease of use.

The Passive Diaphragms

in the K-240, the compliance of the passive diaphragms, combined with acoustical resistances, forms a controlled, highly damped vent to counteract and flatten out the resonant peak. This eliminates boominess down to a lower frequency than would otherwise be possible

The K-240’s unusual construction improves wearing comfort, reduces weight, and totally eliminates annoying user adjustments. Its soft, perforated support band shapes easily to the head and simultaneously self-positions the headphone driver elements comfortably on the ears. At the same time, AKG’s exclusive Cardan (universal-joint gimbal) earpieces automatically, independently, and correctly self adjust to each ear for optimum listening contact.

K-240 utilizes Passive Diaphragms and acoustic “screens” for controlled response and “free field” realism. Dynamic transducers provide accurate reproduction and high output. Universal gimbal (cardan) suspension for each earpiece with self-adjusting headband is comfortable to wear over long periods. Favourite of recording and broadcast studios.

Common to all AKG headphone designs, the circumaural K-240 possesses outstanding features which increase wearing comfort, fit and flexibility of the headphone. Unique self-adjusting headband and cardan-swivels locate the earpieces precisely and accurately regardless of head or ear shape, long-term wearer fatigue is eliminated. Weight is distributed uniformly over wide headbands. In environments where noise could be a problem, circumaural headphones are an ideal selection. And remember, the patented “Passive Diaphragms” yield qualities equal to the most natural listening environment.

Specifications:

Operating Principle:  Dynamic moving coil

Frequency Range:  15 – 20,000 Hz

Sound Pressure Level  (thd 1,0%)

108 dB (at 100 – 2,000 Hz)

112 dB (at 1,000 Hz)

Sensitivity:  20 µb/V

Normal Listening-Level Requirements:  0,5 V (0,4 mW) for 94 dB SPL (=10 uv b)

IHF Sensitivity:  4V (27 mW) for 112 dB SPL (=80 µb)

Nominal Impedance:  600 ohm per system

Maximum Continuous  Input:  11 V (200 mW) =121 dB SPL (per channel)

Total harmonic Distortion:  (at 95 dB SPL):  0,3%

Weight:  224 g (7,9 oz) without cable

Cable Length:  3 m (10 ft) ¼ inch phono plug

Audio Technica AT-701 headphones

 Products of one of the world’s best equipped laboratories for the development of audio and acoustic devices, Audio-Technica headphones bring entirely new levels of reproduction quality and listening enjoyment to the headphone user. Beginning with the acoustic fundamentals, Audio-Technics engineers have brought refreshingly new insights into every aspect of headphone performance.

It is important at the beginning to understand that the design of most conventional headphones is fundamentally incorrect. Most headphones seem to be designed first from a visual standpoint. They are provided with large, impressive ear cups and elaborate-looking headbands. The result is considerable unnecessary weight, an extreme sense of discomfort after only short listening intervals and, most importantly, an unnatural, highly colored sound. The large impressive-appearing ear cups, alas, contribute to severe resonant peaks in frequency response and closed-in-effect.

Audio-Technica headphones are dramatically different from conventional  headphone designs. First, much attention has been paid to keeping total weight extremely low. Likewise the headband is designed to keep the earphones securely in place, yet imparting a minimum of pressure to the head. As a result, Audio-Technica headphones may be worn in complete comfort for any desired period of time.

The acoustic properties of Audio-Technica headphones are likewise highly advanced. The diaphragms are bi-polar radiators. The ear cup provides no restriction to the free movement of the diaphragm; there is no trapped volume of air behind the diaphragm. As a result, higher diaphragm velocities are attained, providing improved transient response and reduced distortion. An “open” feeling is immediately experienced when listening to this type of headphone making conventional, closed-back headphones seem closed-up by comparison. Ambient noise is reduced, permitting complete involvement with the program material, yet the listener is never totally out of contact with the outside world.

Audio-Technica headphones may be used with any standard amplifier or receiver, and dynamic models are provided a convenient coiled cord. Ear pads may be detached readily for replacement if desired.

Model AT-701 Dynamic

Unusually Flat, wide-range response is provided in a model AT-701, also employed a dynamic driver unit of 47 mm diameter. The non-resonant, thermos-formed, polymer diaphragm material offers both stiffness and extremely low mass. Copper plated aluminium wire is used for the voice coil, for minimum mass and excellent electrical characteristics.

Specifications

Frequency Response:  30 – 20,000 Hz

Impedance:  4 – 16 ohms

Sensitivity:  97 dB ±2dB/mW at 1 kHz 

weight:  6,3 oz

Yamaha A-520 amplifier

Yamaha A-520 amplifier

Rec Out Selector with Tape Copy Function

The Yamaha Rec Out Selector is another extremely useful feature which greatly extends the source control capability of the A-520. It allows you to record one source, selected by the Rec Out Selector, while monitoring another completely independent source selected by a front panel input selector. And the Rec Out Selector also allows you to copy tapes between the two tape inputs, in either direction, eliminating the need for complicated re-connections when dubbing tapes between two decks.

Accessory Output Loop

The growing use of graphic equalizers and sound processors in an audio system presents the need for extra connection capability, and a simpler way to make the right connections. The A-520 is prepared for this need with a rear panel accessory output loop. Serving the same role as a tape loop which would otherwise have to be used, it routes a line level signal out to an external graphic equalizer or sound processor and back in to the amplifier. This frees both existing tape loops provided on the amplifier for their intended purpose, and allows easy connection of an external component without interfering with existing rear panel input/output connections.

Heavy Duty Speaker Connection Terminals

the rear panel speaker connection terminals on the A-520 are specially designed to accept speaker cable of maximum thickness with a simple, solid connection. This allows the use of the heaviest gauge speaker cable for maximum signal transmission purity without having to cut or squeeze the cables in, and provides a solid electrical connection that can’t be pulled out. Normal gauge speaker cables can also be used with the same terminals.

Center Defeat Bass and Treble Tone Control

The  bass and treble controls provided on A-520 are specially designed with a center defeat position. When set to their center positions, tone control response is perfectly flat, with no influence on the original signal. When tuned for either a boost or cut, they provide smooth, accurate response over a conveniently wide range.

Subsonic Filter

A  switchable subsonic filter is provided on the A-520 front panel, allowing you to filter subsonic frequency content such as turntable rumble out of the signal, thereby protecting both amp and speakers and preventing needless power drain.

Independent Speaker A/B Selectors

The  A-520 provide rear panel connectors and front panel selectors for two separate pairs of speakers. They can be driven independently or simultaneously, allowing you to drive two remotely located speaker pairs together, or to drive a dual speaker pair setup in a single listening environment, for more listening flexibility.

Specifications

Minimum RMS Output Power per Channel:  75 Watts (8 ohm) from 20 to 20,000 Hz at no more than 0,01% thd

Dynamic Power per Channel (IHF) :  97 W (8 ohm), 169 W (4 ohm), 160 W (2 ohm)

Power Bandwidth (Half Rated Power, 8 ohm):  10 to 50,000 Hz  (0,03% THD)

Damping Factor (1 kHz, 8 ohm):  no more than 50

Input Sensitivity/Impedance

Phono MC :  160 µV /220 ohm

Phono MM :  2,5 mV /47 k ohmn

CD, Video, Tape :  150 mV/47 k ohm

Maximum Input Level

Phono MC :  10 mV (0,01% THD)

Phono MM :  150 mV (0,01% THD)

Output Level /Impedance

Rec Out :  150 mV/470 ohm

Headphone Jack Rated Output/Impedance (8 ohm):  0,7 V (0,01% THD)/270 ohm

Frequency Response: 

CD, Video, Tape :  20 to 20,000 Hz +0dB -0,5 dB

RIAA Equalization Deviation (20 to 20,000 Hz)

Phono MC RIAA :  ± 0,3 dB 

Phono MM RIAA :  ± 0,2 dB 

Total harmonic Distortion: 

Phono MC to Rec Out (3 V) :  0,007%

Phono MM to Rec Out (3 V) :  0,003%

CD, Video, Tape  to Sp Out :  0,005%

Intermodulation Distortion (8 ohm)

CD, Video, Tape :  0,005% (1 W), 0,01% (half Rated Power)

Signal-to-Noise-Ratio:  (IHF-A Network)

Phono MC (500 µV  input Shorted) :  75 dB 

Phono MM (5 mV  input Shorted) :  92 dB 

CD, Video, Tape (input Shorted) :  100 dB 

Signal-to-Noise-Ratio:  (new IHF)

Phono MC (500 µV  input Shorted) :  74 dB 

Phono MM (5 mV  input Shorted) :  78 dB 

CD, Video, Tape (input Shorted) :  84 dB 

Tone Controls

Bass Boost/Cut :  ± 10 dB at 20 Hz

Turnover Frequency :  350 Hz 

Treble Boost/Cut :  ± 10 dB at 20 kHz

Turnover Frequency :  3,5 kHz

Loudness Control (Level Related Equalization):  -40 dB

Dimensions (W x H x D):  435 x 136 x 338 mm (17-1/8” x 5-3/8” x 13-3/8”)

Weight:  7,5 kg (16 lbs 8 oz)

 

Focal Chorus 806V speakers

For Focal, Chorus symbolizes one of the most stimulating challenges for the loudspeaker and refined product manufacturer that we are: to allow the greatest number of consumers to access our technological innovations. For the first two generations Chorus (2000) and Chorus S (2003), the objective was to conserve a hi-end sound and maintain sophisticated Focal technologies by adapting our industrial machine to the highest standards. While outsourcing had become a key economic strategy for the majority of manufacturers, we chose on the contrary to heavily invest in our manufacturing process in order to achieve an exceptional sound quality while at the same time remaining competitive. It is the only possible way in this path of permanent innovation: development and manufacturing of loudspeakers ”Made in France”, design by cabinet-makers, mastery of quality, total autonomy in the design and development of our products. This strategy has been key to the success of the preceding Chorus lines.

This third generation known as Chorus 800 V will go even further in this strategy. Technological innovation does not only solely touch strategic components of the speaker, but the actual whole of the design. Thanks to the use of advanced and exclusive materials, elaborate manufacturing techniques of the cabinets, the Chorus 800 V line of today shines with a unique, hi-end esthetic. Chorus V isn’t only a performing product line, ideal for entering the Focal universe, but objects that will inhabit living spaces, with an innovative esthetic, quality of manufacture and a finish worthy of a higher segment. This is indeed a new esthetic dimension, a new era for the ”Spirit of Sound”.

 

Neutral and balanced, the Chorus 806 V seduces by the richness of its upper midrange and the speed of its bass. An entirely refined speaker, ideal to play in rooms under 20 m2 without any limits. And easily larger spaces if it is combined with SW 800 V.

 

Specifications

Type:  2-way bass-reflex bookshelf speaker

Drivers:

Low Frequency:  165 mm (6-1/2") Polyglass mid-bass

High Frequency:  25 mm (1") TNV AL/Mg Inverted dome tweeter

Frequency Response:  55 Hz - 28 kHz (±3 dB)

Low Frequency Point:  77 Hz (-6 dB)

Sensitivity:  90 dB (2.83 V/1 m)

Nominal Impedance:  8 Ω 

Minimum Impedance:  3,6 Ω 

Crossover Frequency:  3,000 Hz

Recommended Amplifier Power:  25 - 120 W

Dimensions (HxWxD):  390 x222 x 293 mm (15-3/8" x 8-3/4" x 11-9/16")

Net Weight:  8,2 kg  (18 lbs)

 

Focal Chorus 705V speakers

Since the year 2000, the different generations of the Chorus line have benefited from this approach, as we produced speakers that cost less and performed better. To achieve this goal, we invested massively in a superior method to speaker manufacturing, where intelligent machining and precise handwork were absolutely necessary.

It was the only possible way in this drive for quality and competitiveness: development and manufacturing of French-made loudspeakers, design of the cabinets, quality control, a total autonomy in the development and design of our own products. This method allows us to innovate, to entirely and independently turn ideas into reality, to place patents internationally, and have the means to anticipate trends. And finally, to progress.

The third generation, Chorus 700 V, goes even further. A direct descendant of the Chorus 800 V line of which it heavily borrows technical elements (except Power flow) yet with a more Amati traditional finish, Chorus 700 V invites you in to the Focal universe. The build quality and high-end finishing work are entirely unknown in this price-range.

 

Chorus 705 V is the ideal loudspeaker for installation in rooms of modest dimensions (approximately 15 m²). With a responsive and lively bass, it represents the foundations of a great system, especially when paired with the SW 700 V subwoofer.

 

Specifications

Type:  2-way bass-reflex bookshelf speaker, wall mounting.

Drivers:

Low Frequency:  140 mm (5") Polyglass midbass

High Frequency:  25 mm (1") TNV AL./Mg Inverted dome tweeter

Frequency Response:  65 Hz - 28 kHz (±3 dB)

Low Frequency Point:  57 Hz (-6 dB)

Sensitivity:  89 dB (2.83 V/1 m)

Nominal Impedance:  8 Ω 

Minimum Impedance:  3 Ω 

Crossover Frequency:  3,000 Hz

Recommended Amplifier Power:  25 - 100 W

Dimensions (HxWxD):  315 x192 x 248 mm (12-3/8" x 7-9/16" x 9-3/4")

Net Weight:  5,7 kg  (12,5 lbs)

Apogee Acoustics Centaur Minor loudspeakers

The Centaur Minor was Apogee's first and smallest ribbon hybrid when it was released in 1991. Also the cheapest yet Apogee at £1150 in the UK, and a similar price in $'s in the US.

At 100 cm tall, 35 cm wide and 22 cm deep, its footprint is no bigger than a stand mounted mini-monitor speaker.

The 26" (6 element) etched ribbon tweeter is the same version which is used in the later model of the Stage. The 6.5" dynamic cone woofer is in a long rectangular enclosure set towards the outside of the speaker so the dipole ribbon fires into 'free air'. It is positioned at a height which is the mid-point of the ribbon tweeter, it can just be seen behind the (hard to remove) grill.

 

Specifications

Bass :  6.5" Dynamic cone

Midrange :  26" Aluminium/Kapton ribbon (etched 6 segment)

Max. Sound Level:  107 dB

Sensitivity (at 3 m):  85 dB

Frequency Response:  40 Hz - 20,000 Hz  (-3dB)

Recommended Amplifier Power:  50 W (8 Ω  load)

Crossover Frequency:  800 Hz

Nominal Impedance:  6 Ω  (4 Ω  minimum)

Dimensions)H x W x D): 1000 x 350 x 220 mm

Weight:  52 lbs each

Finishes Available:  Silver grey

 

Apogee Acoustics Centaur Major loudspeakers

The Centaur range was the first hybrid speakers range from Apogee, the Centaur Major being biggest model.

Using a 10" dynamic woofer and a 40" ribbon tweeter the Major stands 163cm tall, 46cm wide and a total depth of 30cm.

The enclosure for the woofer is approximately 107cm high, 28cm wide and deep. The tweeter ribbons are on the inside edge of each speaker and like all Apogee's work as a dipole.

The speakers are nearly as room dominating as the Duetta Signatures, with only the width being significantly smaller, and require nearly as much free space around them.

Although they will work with smaller amps, they justify being fed by a high quality, high current amp.

 

Specifications

Bass :  10" Dynamic cone

Midrange :  40" Aluminium/Kapton ribbon (etched 5 segment)

Max. Sound Level:  110 dB

Sensitivity (at 3 m):  83 dB

Frequency Response:  30 Hz - 20,000 Hz  (-3dB)

Recommended Amplifier Power:  100 W (8 Ω  load)

Crossover Frequency:  450 Hz

Nominal Impedance:  6 Ω  (3,5 Ω  minimum)

Dimensions)H x W x D): 1630 x 460 x 300 mm

Weight:  100 lbs each

Finishes Available:  Rosewood, walnut, oak and mahogany or silver grey

 

Adcom GFA-545 power amp

Adcom GFA-545 represents the most advanced thinking in audio amplifier design. At 100 watts per channel, the GFA-545 offers an exceptional value; superior performance at a reasonable price.

Some of the outstanding features of this amplifier are:

100 watts per channel, 20 Hz - 20 kHz, into an 8 Ω  load with both channels driven with less than 0,09% Total Harmonic Distortion.

The ability to drive low impedance loads

Large Heat sinks to dissipate heat from the power transistors

External and internal fuses which are designed to protect your loudspeakers from possible damage and also to protect the amp itself under all but the severest abuse of operating conditions.

A thermal cutoff is also employed to protect the amplifier under high temperature conditions.

Instantaneous Distortion Alert which indicates when distortion products are above the 1% level.

 

The instantaneous Distortion Alert is a unique distortion detection circuit which reads all forms of distortion - T.H.D., Intermodulation DIstortion, Slew Induced, and DC-offset, peak LEDs, one per channel, will glow when distortion is above 1% regardless of the load impedance or reactance in use, the LEDs may occasionally flicker under high volume listening. It they glow brightly or are on most of the time that you are listening, you are overdriving your equipment and should turn down your volume control.

 

The GFA-545 is a truly significant contribution to the advancement of sound technology. To ensure that the quality of construction is on par with the quality of the sonics, (a much neglected area in many other amplifiers) the GFA-535 has been carefully developed with computer controlled metal fabrication techniques that maintain 0,005 of an inch tolerances throughout. Full electrical inspection of each and every circuit board, sub-assembly , as well as the finished amplifier, provide a mechanically and sonically superior product for your enjoyment.

 

Specifications

Continuous Power Output (both channels, 20 Hz - 20 kHz, less than 0,09% T.H.D.):

100 watts/channel at 8 Ω

150 watts/channel at 4 Ω

Signal-to-Noise Ratio (A-weighted, Full output):  better than 106 dB

Input Impedance:  22 k Ω

Input Sensitivity

For rated Output :  1,3 Volt

For 1 watt :  130 mV

Damping Factor (20 Hz - 20 kHz):  better than 130

Dynamic Headroom (at 4 Ω ):  2,6 dB

Available Voltage:  120 V at 60 Hz, 220 V at 50 Hz

Dimensions (W x H x D):  432 x 140 x 318 mm (17" x 5-1/2" x 12-1/2")

Shipping Weight:  12,2 kg (27 lbs)

 

Adcom GFA-535 power amp

Adcom GFA-535 represents the most advanced thinking in audio amplifier design. At 60 watts per channel, the GFA-535 offers an exceptional value; superior performance at a reasonable price.

Some of the outstanding features of this amplifier are:

60 watts per channel, 20 Hz - 20 kHz, into an 8 Ω  load with both channels driven with less than 0,09% Total Harmonic Distortion.

The ability to drive low impedance loads

Output for 2 pairs of speakers

Two additional AC outlets for a CD Player, Tuner, or other audio components up to 100 watts maximum

Instantaneous Distortion Alert which indicates when distortion products are above the 1% level.

The instantaneous Distortion Alert is a unique distortion detection circuit which reads all forms of distortion - T.H.D., Intermodulation DIstortion, Slew Induced, and DC-offset, peak LEDs, one per channel, will glow when distortion is above 1% regardless of the load impedance or reactance in use, the LEDs may occasionally flicker under high volume listening. It they glow brightly or are on most of the time that you are listening, you are overdriving your equipment and should turn down your volume control.

The GFA-535 is a truly significant contribution to the advancement of sound technology. To ensure that the quality of construction is on par with the quality of the sonics, (a much neglected area in many other amplifiers) the GFA-535 has been carefully developed with computer controlled metal fabrication techniques that maintain 0,005 of an inch tolerances throughout. Full electrical inspection of each and every circuit board, sub-assembly , as well as the finished amplifier, provide a mechanically and sonically superior product for your enjoyment. At the time of its design, no other product on the market which offered the design and construction quality of the GFA-535 at anything close to its selling price.

 

Specifications

Continuous Power Output (both channels, 20 Hz - 20 kHz, less than 0,09% T.H.D.):

60 watts/channel at 8 Ω

100 watts/channel at 4 Ω

Signal-to-Noise Ratio (A-weighted, Full output):  better than 106 dB

Input Impedance:  22 k Ω

Input Sensitivity

For rated Output :  1,0 Volt

For 1 watt :  130 mV

Damping Factor (20 Hz - 20 kHz):  better than 130

Dynamic Headroom (at 4 Ω ):  3 dB

Available Voltage:  120 V at 60 Hz, 220 V at 50 Hz

Dimensions (W x H x D):  432 x 83 x 318 mm (17" x 3-1/4" x 12-1/2")

Shipping Weight:  10 kg (22 lbs)

 

Kyocera C-901 preamplifier

 

Control Preamplifier

Featuring Direct Coupling from  Front End to Output Terminals

 

Features:

Input Selector (Phono 1, Phono 2, Tuner, Aux)

Phono Selector (MC and MM cartridge)

Tape Monitor (1, source, 2)

Tape Copy (1 - 2; off; 2 - 1)

Mode (Stereo, Mono)

Muting (0, -20 dB)

Subsonic Filter (On, Off)

Bass, Mid, Treble (Detented variable)

Tone Switch (On, Off)

Bass Center Frequency (100 Hz, 50 Hz)

Mid Center Frequency (1 kHz)

Treble Center Frequency (10 kHz, 20 kHz)

Pre Out Switch (On, Off)

Inputs (Phono 1 & 2, Tuner, Tape 1 & 2, Aux)

Outputs (Tape 1 & 2, Preout 1 & 2)

Phones Jack

 

Specifications

Input Sensitivity/Impedance

Phono 1, 2 MC :  120 µV/1 K Ω

Phono 1, 2 MM :  2,5 mV/27 k Ω - 47 k Ω  - 100 K Ω

Tuner Aux, Tape 1, 2 :  150 mV/130 K Ω

Total Harmonic Distortion (20 Hz - 20 kHz)

Phono MC (1,5 V output) :  0,007%

Phono MM (13 V output) :  0,007%

Tuner, Aux, Tape (1,5 V output) :  0,007%

Tuner, Aux, Tape (13 V output) :  0,007%

Rated Output Power/Impedance

Rec Out :  150 mV/600 Ω

Pre Out :  1,5 V/22 Ω

Signal-to-Noise Ratio

Phono MC :  70 dB

Phono MM :  86 dB

Tuner, Aux, Tape :  110 dB

Frequency Response

Phono MC (20 Hz - 20 kHz) RIAA ±0,2 dB

Phono MM (20 Hz - 20 kHz) RIAA ± 0,2 dB

Tuner, Aux, Tape (20 Hz - 20 kHz) +0 -0,2 dB

Tuner, Aux, Tape (5 Hz - 100 kHz) +0 -1,0 dB

Maximum Input Level

Phono MM, MC :  1 kHz (RMS)

Maximum Output Voltage:  13 V

Tone Controls

Bass ±10 dB at 100 Hz - 50 Hz

Mid :  ±10 dB at 1 kHz

Treble :  ±10 dB at 10 kHz - 20 kHz

Subsonic Filter:  15 Hz (12 dB/oct)

Muting:  -20 dB

Power Supply:  AC 120 V, 60 Hz

Power Consumption:  80 W

Dimensions (W x H x D):  18-7/16" x 5-3/16" x 14-7/16"

Weight:  15,4 lbs

Kyocera B-901 power amp

 

MOS FET Power Amplifier

Incorporating Direct Coupled Triple Push-Pull MOS FET Power Output

 

Features

Powe Switch

Protection Indicator

Peak Indicator

Input Jack

Input sensitivity switch

Power Indicator

Speaker terminals

 AC outlet

 

Specifications

Power Amplifier

Power Output

130 W + 130 W at 8 Ω , 20 Hz - 20 kHz

180 W + 180 W at 4 Ω , 20 Hz - 20 kHz

Total Harmonic Distortion

0,01% at 8 Ω , 20 Hz - 20 kHz

0,02% at 4 Ω , 20 Hz - 20 kHz

Frequency Response

20 Hz - 20,000 Hz +0 -0,2 dB

5 Hz - 100,000 Hz +0 -1,0 dB

Signal-to-Noise Ratio:  -120 dB

Hum and Noise:  0,2 mV

Damping Factor (8 Ω , 50 Hz):  80

Input Sensitivity/Impedance"  1,5 V; 3,0 V /30 k Ω

Power Supply:  AC 120 V, 60 Hz

Power Consumption:  500 W

Dimensions (W x H x D):  18-7/16" x 7-3/16" x 15-11/16"

Weight:  48,4 lbs

 

Sony TA-F444ES amplifier

ES-Series Integrated Amplifier

Specially designed for the demands of digital audio

 

Digital audio places stringent demands on the rest of a stereo system. That's why Sony created the TA-F444ES - it matches digital audio's impressive performance, in terms of dynamic range, stereo separation, and low noise and distortion. Many features contribute to this superior performance. Audio Current Transfer (ACT) uses current amplification to reduce crosstalk and improve separation. High dynamic headroom improves dynamic range. Sony's Legato Linear design eliminates switching and crossover distortion. A Linear Gain volume control assures identical performance at all listening levels. These features all contribute to the amp's outstanding performance with digital sources.

 

The best way to demonstrate the terrific performance of the TA-F444ES is to put it through a workout with a Sony CD player. Choose a Compact Disc that features wide dynamic range and low noise. Play the amp very loud first. Let the customer experience the dynamics - be sure he hears both very loud and very soft passages. During a quiet passage, point out the lack of noise. Then turn the volume down to a quieter level. Explain how the performance remains outstanding; i.e. separation, noise and dynamic characteristics are all still superb. Let the customer enjoy the "feel" of the amplifier, and experience its performance on his own.

 

Features:

Record output selector - permits the user to listen to one source while recording another

Defeatable bass boost - provides additional bass response for speaker which require it

Tone defeat switch - eliminates the tone control circuitry from the audio signal path

Two tape monitor loops - with tape dubbing in both directions

Soft touch controls - for function selection makes switching to another signal source easy and elegant. LEDs indicated which source is in use

4 position speaker selector switch - A, B, A + B, Off

Front panel headphone jack

Oversized volume control knob

ACT "Audio Current Transfer" - uses current amplification to reduce internally generated distortion

Linear Gain Volume control - assures consistently outstanding performance at all volume levels

Legato Linear amplifier circuitry - eliminates switching and crossover distortion

Switchable subsonic filter - eliminates the effects of turntable rumble and other subsonic distortion

Consistent low impedance performance

 

Specifications

Continuous Power Output RMS : 

80 watts per channel, both channels driven into 8 Ω  from 20 Hz to 20 kHz, at no more than reted T.H.D.

80 watts per channel, both channels driven into 4 Ω  from 20 Hz to 20 kHz, at no more than rated T.H.D.

Total Harmonic Distortion : 

0,004% (from 20 Hz to 20 kHz at rated output , 8 Ω )

0,006% (from 20 Hz to 20 kHz, at rated output, 4 Ω )

Intermodulation Distortion:

0,004% (60 Hz : 7 kHz = 4 : 1, at rated output , 8 Ω )

0,006% (60 Hz : 7 kHz = 4 : 1,, at rated output, 4 Ω )

Power Bandwidth (IHF): 

5 Hz - 0 kHz (40 watts, 8 Ω , 0,004% T.H.D.)

 5 Hz - 80 kHz (55 watts, 4 Ω , 0,006% T.H.D.)

Dynamic Headroom:  1,8 dB (4 Ω or 8 Ω , IHF-1978)

Damping Factor:  125 at 1 kHz, 8 Ω

Residual Noise:25 µV (A-weighted, 8 0hm)

Slew Rate:  125 Volts/µsec (250 Volts/µsec, IHF)

Dynamic Range (Tuner, Tape, Aux, CD) :  120 dB

Frequency Response

Phono :  RIAA standard ±0,2 dB

Tuner, Tape, Aux, CD :  20 Hz - 200 kHz -0,3 dB

Channel Separation

Phono MM :  95 dB

Phono MC :  80 dB

Tuner, Tape, Aux, CD :  100 dB

Input Sensitivity/Impedance/Capacitance

Phono MM :  2,5 mV/50 k Ω

Phono MC :  170 µV/100 Ω  at 40 Ω  setting (170 µV/400 Ω  at 3 Ω  setting)

Tuner, Tape, Aux, CD :  150 mV/50 Ω

Signal-to-Noise Ratio

Phono MM :  83 dB (IHF-A) at 2,5 mV [87 dB new IHF]

Phono MC :  73 dB (IHF-A) at 0,125 mV [70 dB new IHF]

Tuner, Tape, Aux, CD :  102 dB (IHF-A) [97 dB new IHF]

Maximum Input Capability

Phono MM :  150 mV

Phono MC :  9 mV

Tone Controls

Bass :  ±8 dB at 60 Hz

Treble :  ±8 dB at 25 Hz

Bass Boost Switch:  +4 dB at 50 Hz

Subsonic Filter:  6 dB/ocave below 15 Hz

Speaker Impedance:  4 - 16 Ω

Power Outlets:

Switched :  (2) 100 Watts, max. ea

Unswitched:  (2) 100 Watts, max. ea.

Power Supply:  120 Volts AC, 60 Hz

Power Consumption:  260 watts

Dimensions (W x H x D):  430 x 130 x 430 mm (17" x 5-1/8" x 17")

Weight:  13,5 kg (29 lbs 13 oz)